Question about booleans in Rhino 8

Is this a specification of Rhino 8 and is it impossible to solve?

1 Like

The V8 result you showed does not look like a BooleanUnion. Please post a file to test.

The result of the BooleanUnion will depend on whether your open surface has its normals facing inwards or outwards. But in any case if the open polysurface matches the closed cylinder it should union, but you will be left with one or the other of the closed solids below:

https://wiki.mcneel.com/rhino/booleanfaq
(check the section on “Open objects”)

1 Like

thank you for your reply

I understand about surface normals

In Rhino 6, the result will be similar to the reply you received.
However, even if I perform the same operation on Rhino 8, I do not get this result, so I am in trouble.

Can I solve the problem by changing some software settings?

Please post your file…

1 Like

Is this OK?
1.3dm (68.7 KB)

Hello- so far this works as expected here.

-Pascal

Thank you for your reply
So does this mean it’s just me?
Looks like I’ll have to try the same operation on Rhino 7 as well.

Hello- I don’t know - I could not get the result you show in the image with BooleanUnion of these two objects - can you please run SystemInfo in Rhino and copy/paste the results here?

-Pascal

Apparently it is by design that Rhino 6 and Rhino 8 will give different results.
I hope it gets fixed

No, they give the same results. It’s working by design in both.

Nothing to fix…